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Post by Sue Butcher on Jan 16, 2017 4:32:30 GMT
Back to question of saving recordings like these to digital via 625 line conversion, I've been given the name of someone who has in the past successfully home-built electronic video standard converters. I'll ask them about the 405 to 625 problem.
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Post by richardwoods on Jan 16, 2017 19:26:43 GMT
Just as an aside, I remember messing about with a dual standard set with a fault on the 625 line circuit back in the 70's. I had the UHF tuner working through the 405 circuit, you could get a serviceable picture by messing around with the values of components in the horizontal hold circuits, but it was in negative, which if I remember correctly was resolved by reversing a diode. All done to get BBC2 on a teenagers (my) bedroom telly.
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Post by richardwoods on Jan 16, 2017 19:33:18 GMT
Didn't I read somewhere that some cable TV installations in the 60's use primitive standards converters to "broadcast" BBC2 on 405 lines in some locations. No real relevance to what Sue is talking about, but interesting non the less. Incidently, has anyone spoken to Aurora? I know that they don't do an off the shelf 405 to 625 standards converter but given the specialist range of what they offer (including 625 to Baird mechanical standards!), would they be willing to build a prototype?
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Post by Sue Butcher on Jan 17, 2017 0:32:19 GMT
Daryl Hock is the Aurora designer and the man to ask. A one-off will probably be costly, since there's less demand for an off-the-shelf 405 to 625 converter and he wouldn't get much of the design investment back through sales. And Paul says there's a converter project already funded, so going to Daryl might be a duplication of effort. What I was hoping for was a back-yard boffin who could do it simply and cheaply.
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Post by richardwoods on Jan 17, 2017 18:14:28 GMT
I was wondering if the costs would be perhaps less than you would expect, there can't be much demand for the 30 line Baird converters they advertise, I would imagine that the numbers sold would be tiny so they are set up for small manufacturing runs? Anyway as you say it would probably be duplication of effort. I'm pretty sure this was suggested when Paul asked a few years ago so he may well have discussed it with them. Regarding boffins, yes they are definitely out there, will keep an ear to the ground.
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Post by richardwoods on Jan 17, 2017 18:21:23 GMT
Just as an aside, I remember messing about with a dual standard set with a fault on the 625 line circuit back in the 70's. I had the UHF tuner working through the 405 circuit, you could get a serviceable picture by messing around with the values of components in the horizontal hold circuits, but it was in negative, which if I remember correctly was resolved by reversing a diode. All done to get BBC2 on a teenagers (my) bedroom telly. I'm pretty sure that some sort of primitive 405 to 625 converter could be made based on a dual standard TV circuit and reversing the procedure I described above, but I'm sure that it wouldn't be good enough quality for what is being looked at, but it is possible and could be refined by a back room boffin, I'm sure. |
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Post by Sue Butcher on Jan 17, 2017 23:35:20 GMT
Yes, but that's not conversion of the line standard, it's alteration of the set to show 405 pictures. The video signal is still 405 line all the way through. Elderly 625 line sets will show a squashed 525 line pictue if you adjust the hold, no conversion process involved.
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Post by Peter Stirling on Jan 18, 2017 11:55:30 GMT
Yes, but that's not conversion of the line standard, it's alteration of the set to show 405 pictures. The video signal is still 405 line all the way through. Elderly 625 line sets will show a squashed 525 line pictue if you adjust the hold, no conversion process involved. Warning this just a ramble, a stream of thought that may not make any sense in the real world...  Transferring to VHS/Umatic is quite handy for reference purposes, but I think it has a set back for quality recordings? -I doubt if the drop out compensator will work as it's obviously timed for 625 line recordings. So the highest quality tapes must be used. I was wondering if something could be done with the VGA standard? as this would enable the signal to get into a computer. RGB (with sync on green) to VGA converters are available and obviously it would be the green lead we would be interested in. This would pose some other problems, the sync would have to be flipped as it's positive going on 405 line and something would probably have to be done with the low 405 line rate as anything below 15Khz could possibly cause damage somewhere? . If it could be done then the VGA could be converted to HDMI which would give access to anywhere. |
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Post by richardwoods on Jan 18, 2017 18:29:01 GMT
Yes, but that's not conversion of the line standard, it's alteration of the set to show 405 pictures. The video signal is still 405 line all the way through. Elderly 625 line sets will show a squashed 525 line pictue if you adjust the hold, no conversion process involved. Oops, sorry Sue, that's a fair point when you think about it. LOL. I got carried away reminiscing about messing around with old tellys. |
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Post by Sue Butcher on Feb 3, 2017 2:19:19 GMT
Currently at Goldborne Vintage Radio there's a discussion thread "Thoughts on standards conversion" which touches on this problem. There is a analogue to digital converter available (Data Translation DT 9862) that can convert an analogue signal of up to 10MHz and get it into a computer via USB in a continuous stream. Cost is $3000-$4000 US. Since a 405-line video signal has a bandwidth of about 2MHz, this should be able make a digital copy of a 405-line tape which could be stored until a conversion program is developed.
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Post by williammcgregor on Feb 6, 2017 14:07:59 GMT
Just to let forum members know that there is an interview with Ayeshea in this month's Record Collector magazine #463.
It's over 3 pages...don't get excited as unfortunately, there are no (new) revelations about "Lift Off"
The category of questions asked are as follows...
Were you always going to be an entertainer of some kind?
How did you get your first record deal?
How did you end up touring with Jimmy Cliff in 1965-66?
After touring with Jimmy Cliff, you started playing at the marquee...
Did you take drugs?
What are your fondest memories of being at the marquee?
Who else did you date at this time?
Is it true you dated Rod Stewart?
Did you see Jimi Hendrix play?
How did you meet Chris Brough?
People forget just what an iconic show "Lift Off" was...she mentions Lift off as being shown on Wednesday's therefore beating TOTP to the punch, also mentions Slade first showing of "Merry Christmas Everybody" and David Bowie's first performance of "Starman"
Wizzard also made their TV debut on Lift Off in 1972, playing Ball Park Incident. Is that where you first met Roy Wood? answer: Yeah, he was a genius, and how he worked hard in his basement
How did you discover that the Lift Off tapes had been wiped? answer: same as we know already about someone made a b***s up of transferring tapes
Do you think there are copies of those tapes still out there? answer: she hopes so and that she needs to get onto social media and put the word out. Loads of people must have taped various shows, she never videoed herself, because she was working 7 days a week, she thinks there has to be a tape of Bowie.
What do you recall of Bowie and the Spiders coming in? answer: She was'nt there that day, she'd known Bowie since she was 16
When did you leave for California?
Did you regularly get together with the neighbours?
What keeps you busy these days?
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Post by David Huggins on Feb 7, 2017 0:13:20 GMT
I'm very late to the topic here, but earlier I stumbled across an interview with Phil Morris on YouTube where he mentions that he's working on developing a system for transferring 405-line videotapes electronically. Just a brief mention but I thought it might be of some interest. Apols if this has already been posted.
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Post by jbuoys on Feb 9, 2017 18:41:25 GMT
Out of all this the person I feel sorry for, if this material remains at best unavailable or at worst lost is Ayesha Brough. Absolutely. That said, I'm sure Ayshea must be aware of the existence of Ronnie's Lift Off recordings. |
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Post by richardwoods on Feb 9, 2017 19:29:30 GMT
Out of all this the person I feel sorry for, if this material remains at best unavailable or at worst lost is Ayesha Brough. Absolutely. That said, I'm sure Ayshea must be aware of the existence of Ronnie's Lift Off recordings. Well in a way that makes things worse, unless of course Ronnie is in touch with her already and keeping it private. |
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Post by danielsteel on Dec 29, 2017 20:37:46 GMT
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